Blender 2.78 Manual for offline use - how - where?
There is a link for the online documents here: https://docs.blender.org/manual/en/dev . I'm not sure why it doesn't work, but there is a link to download a zip file, but the actually link tag isn't working in the wiki. For now, you can download directly, I guess: https://docs.blender.org/manual/en/dev/blender_manual.zip